More advanced stages of dental formation indicate less time until dental eruption. The strong correlation with crown length/total length proportion (CL/TL) provides a linear regression equation for prediction of the timing of eruption of mandibular second premolars.
Objective: The aim of this study was to assess the effects of combined headgear used alone
or in association with rapid maxillary expansion, as the first step for Class II
malocclusion treatment. Methods: The sample comprised 61 patients divided into three groups: Group 1, combined
headgear (CH); Group 2, CH + rapid maxillary expansion (CH + RME); and Group 3,
control (CG). In Group 1, patients were treated with combined headgear until Class
I molar relationship was achieved. In Group 2, the protocol for headgear was the
same; however, patients were previously subject to rapid maxillary expansion. Results: Results showed distal displacement of maxillary molars for both experimental
groups (p < 0.001), with distal tipping only in Group 1 (CH)
(p < 0.001). There was restriction of forward maxillary
growth in Group 2 (CH + RME) (p < 0.05) and clockwise rotation
of the maxilla in Group 1 (CH) (p < 0.05). Conclusion: Based on the results, it is possible to suggest that treatment with both
protocols was efficient; however, results were more significant for Group 2 (CH +
RME) with less side effects.
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